SINGLE SCREW CHILLERS IMM
Engineered for Flexibility and Performance 9
3.2 Working principles of single screw chiller with Flash-tank Economizer
1. Low temp/pressure refrigerant gas enters the compressor. After compression, the gas will be
discharged into oil separator in high temp/pressure;
2. Oil is separated from refrigerant in oil separator. The former goes back to compressor and the
later goes to condenser;
3. Refrigerant gas is condensed to high pressure liquid and then goes through expansion valve to
the Flash-tank Economizer. Gas and liquid will be separated in the economizer and the former
goes back to compressor and the later goes to evaporator with low pressure and temperature;
4. Refrigerant liquid absorbs heat from AHUs in evaporator so that the chiller can provide lower
temperature water;
5. Refrigerant gas goes back to compressor for the next circulation.
Fig.3-2
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